Torque feedback unit and steer-by-wire system

Abstract

The present application relates to the technical field of automobile steering, and provides a torque feedback unit and a steer-by-wire system. The torque feedback unit is applied to the steer-by-wire system and comprises a motor and a worm shaft coaxially connected with the motor, wherein an end of the worm shaft away from the motor is provided with a torque measuring part, the torque measuring part is a non-functional part of the torque feedback unit, and the torque measuring part is clamped to transmit the output torque of the motor when the output torque of the motor is detected. The torque measuring part as a non-functional part is arranged at the tail end of the worm shaft of the torque feedback unit, the torque measuring part can be clamped by a torque detection device to transmit the output torque of the motor when the output torque of the motor is detected, the detection of the output torque of the motor does not affect the functional part of the torque feedback unit, and thus the normal function of the torque feedback unit is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile steering technology, in particular to a torque feedback unit and a steer-by-wire system. BACKGROUND

[0002] Steer-by-wire (SbW) is a new type of steering technology, which cancels the mechanical connection between the steering wheel and the chassis, and has the advantages of fast reaction, comfort, lightness, etc.

[0003] In order to ensure safety, the steer-by-wire system is provided with a torque feedback unit (TFU: Torque Feedback Unit), which is connected to the steering wheel through a steering shaft, and is used to provide a resistance torque when the vehicle is steering, so as to simulate the road feel information feedback to the driver.

[0004] The torque feedback unit generates a resistance torque through a motor, and the torque output by the motor is transmitted to the steering shaft through a worm and a worm wheel. After the torque feedback unit is assembled and put into use, the output torque of the motor needs to be detected to ensure that the performance of the motor meets the use requirements.

[0005] At present, when detecting the output torque of the motor of the torque feedback unit, a torque detection device is usually used to clamp the nut at the tail end of the worm to read the output torque of the motor. The nut is a functional component of the torque feedback unit, which is screwed at the tail end of the worm and used to axially tighten the bearing arranged at the tail end of the worm. In the current detection method, since the torque detection device directly clamps the nut, the output torque of the motor is transmitted through the nut, which can easily cause the nut to loosen during detection, resulting in loosening of the assembly of the worm and affecting the function realization of the torque feedback unit.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0007] Therefore, the present application provides a torque feedback unit and a steer-by-wire system, in which a torque measurement part as a non-functional component is arranged at the tail end of the worm shaft of the torque feedback unit. The torque measurement part can be clamped to transmit the output torque of the motor when detecting the output torque of the motor, so that the detection of the output torque of the motor does not affect the functional components of the torque feedback unit, thereby ensuring the normal function realization of the torque feedback unit.

[0008] According to an aspect of the present application, a torque feedback unit is provided for a steer-by-wire system, the torque feedback unit comprising a motor and a worm shaft coaxially connected with the motor, wherein: a tail end of the worm shaft away from the motor is provided with a torque measuring portion, the torque measuring portion being a non-functional part of the torque feedback unit, and the torque measuring portion is clamped to transmit the output torque of the motor when detecting the output torque of the motor.

[0009] The torque feedback unit described above is provided with the torque measuring portion as a non-functional part at the tail end of the worm shaft, and the torque measuring portion can be clamped by the torque detection device to transmit the output torque of the motor when detecting the output torque of the motor, so that the detection of the output torque of the motor does not affect the functional parts of the torque feedback unit, thereby ensuring the normal function of the torque feedback unit.

[0010] The torque measuring portion is provided at the tail end of the worm shaft, and the worm shaft is coaxially connected with the motor, and the output torque transmitted by the torque measuring portion is basically not lost; thereby, the performance of the motor can be accurately detected through the torque measuring portion, and the performance of the motor is ensured to meet the use requirements.

[0011] In addition, the torque measuring portion is provided at the tail end of the worm shaft, and the space at the tail end of the worm shaft along the axis of the worm shaft is fully utilized, so that the output torque of the motor can be accurately transmitted, and the strength of the parts of the torque feedback unit and the system transmission efficiency are not affected.

[0012] In some embodiments, the torque measuring portion comprises a gasket fixedly sleeved at the tail end of the worm shaft, the gasket is axially clamped between a first bearing and a first limiting nut, and the outer periphery of the gasket is formed as a clamping portion; wherein the tail end of the worm shaft is supported by the first bearing, and the first limiting nut is screwed on the tail end of the worm shaft and axially abuts against the inner ring of the first bearing.

[0013] The first bearing and the first limiting nut are inherent functional parts of the tail end of the worm shaft, the gasket is axially clamped between the first bearing and the first limiting nut, the fixed assembly with the worm shaft can be realized by using the inherent functional parts of the tail end of the worm shaft, thereby accurately transmitting the output torque of the motor; and the gasket has simple structure, convenient assembly and small space occupation, and does not affect the inherent functional parts of the worm shaft and the transmission efficiency of the torque feedback unit.

[0014] In some embodiments, the inner periphery of the gasket is formed as an engaging portion, and the gasket is fixedly connected with the worm shaft through the engaging portion.

[0015] The gasket is stably engaged with the worm shaft through the engaging portion to accurately transmit the output torque of the motor.

[0016] In some embodiments, the engaging portion is non-circular.

[0017] The engaging portion is formed as a non-circular shape to achieve fixed engagement with the worm shaft.

[0018] In some embodiments, the engaging portion comprises a radially symmetrical flat surface and / or a radially inwardly convex boss.

[0019] The engaging portion in one or more forms such as a radially symmetrical flat surface and / or a radially inwardly convex boss enables the washer to stably engage the worm shaft.

[0020] In some embodiments, the clamping portion has a radial dimension greater than the outer diameter dimension of the first limiting nut.

[0021] The clamping portion has a radial dimension greater than the outer diameter dimension of the first limiting nut to ensure that the torque detection device can clamp the clamping portion of the washer beyond the first limiting nut to achieve detection of the output torque of the motor.

[0022] In some embodiments, the clamping portion has a radial dimension smaller than the inner diameter dimension of a second limiting nut; wherein the second limiting nut is fixed to the tail end of the housing of the worm shaft and axially presses the outer ring of the first bearing.

[0023] The second limiting nut is an inherent functional component of the tail end of the worm shaft, and the clamping portion has a radial dimension smaller than the inner diameter dimension of the second limiting nut to ensure that the arrangement of the clamping portion does not affect the inherent functional components of the worm shaft and facilitates the torque detection device to extend into the second limiting nut to clamp the clamping portion of the washer when detecting the output torque of the motor.

[0024] In some embodiments, the torque measurement portion comprises a recess integrally formed at the tail end of the worm shaft, and the outer contour of the recess is formed as the clamping portion; wherein the tail end of the worm shaft is provided with a threaded portion for screwing the first limiting nut, and the recess and the threaded portion do not interfere with each other.

[0025] The recess is integrally formed at the tail end of the worm shaft to accurately transmit the output torque of the motor, and the recess and the threaded portion do not interfere with each other, for example, a special-shaped hole is formed in the worm shaft from the end face of the tail end of the worm shaft to the inside of the worm shaft to form the recess, which does not affect the threaded portion arranged on the outer wall of the tail end of the worm shaft; in this way, the part of the tail end of the worm shaft is fully utilized without occupying other space, which not only achieves transmission of the output torque of the motor, but also does not affect the inherent functional components of the worm shaft and the transmission efficiency of the torque feedback unit.

[0026] In some embodiments, the torque measuring portion comprises an extension portion integrally formed at the tail end of the worm shaft, the extension portion is located at the side of a first limiting nut away from a first bearing, and the outer contour of the extension portion is formed as a clamping portion; wherein the tail end of the worm shaft is supported by the first bearing, and the first limiting nut is screwed on the tail end of the worm shaft and axially abuts against the inner ring of the first bearing.

[0027] The extension portion integrally formed at the tail end of the worm shaft can accurately transmit the output torque of the motor, and the extension portion located at the side of the first limiting nut away from the first bearing can make full use of the space of the tail end of the worm shaft without affecting the inherent functional components of the worm shaft.

[0028] In some embodiments, the clamping portion is non-circular.

[0029] The clamping portion formed as a non-circular shape can stably clamp the torque detection device.

[0030] In some embodiments, the clamping portion is hexagonal.

[0031] The clamping portion formed as a hexagonal shape can match the general torque detection device to realize convenient detection of the output torque of the motor of the torque feedback unit.

[0032] According to another aspect of the present application, a steer-by-wire system is provided, which comprises the torque feedback unit according to any of the above embodiments.

[0033] The present application has at least the following beneficial effects compared with the prior art:

[0034] The torque feedback unit of the present application is provided with a torque measuring portion as a non-functional component at the tail end of the worm shaft, the torque measuring portion can be clamped by a torque detection device to transmit the output torque of the motor when detecting the output torque of the motor, so that the detection of the output torque of the motor does not affect the functional components of the torque feedback unit, thereby ensuring the normal function of the torque feedback unit;

[0035] The torque measuring portion is provided at the tail end of the worm shaft, the worm shaft is coaxially connected with the motor, and the output torque transmitted by the torque measuring portion has little loss; thereby, the performance of the motor can be accurately detected through the torque measuring portion to ensure that the performance of the motor meets the use requirements;

[0036] In addition, the torque measuring portion is provided at the tail end of the worm shaft, and the space of the tail end of the worm shaft along the axis of the worm shaft is fully utilized, which can not only accurately transmit the output torque of the motor, but also will not affect the strength of the parts of the torque feedback unit and the system transmission efficiency.

[0037] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application, as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application. It is to be understood that the drawings are designed solely for purposes of illustration to be used in conjunction with the description in

[0039] Figure 1 Fig. 1 shows a structure diagram of a torque feedback unit in an embodiment of the present application;

[0040] Figure 2 Fig. 2 shows an exploded diagram of the torque feedback unit provided with a gasket in an embodiment of the present application;

[0041] Figure 3 Fig. 3 shows a structure diagram of the gasket in an embodiment of the present application;

[0042] Figure 4 Fig. 4 shows a structure diagram of the gasket in another embodiment of the present application;

[0043] Figure 5 Fig. 5 shows a structure diagram of the torque feedback unit provided with a recess in an embodiment of the present application;

[0044] Figure 6 Fig. 6 shows a structure diagram of the torque feedback unit provided with an extension in an embodiment of the present application. DETAILED DESCRIPTION

[0045] Example implementations will now be described with reference to the drawings; however, these implementations are merely examples and are not intended to limit the present application. Rather, the present application is intended to encompass a variety of implementations and alternatives. In particular, although example implementations are described below with reference to a wireless communication device, the present application is not intended to be limited to these implementations. Rather, the present application is intended to encompass a variety of implementations and alternatives.

[0046] The accompanying drawings are included to provide a further understanding of principles of the application and no limitations on the present application are intended to be derived therefrom. The drawings are included as part of this specification and, together with the specification, serve to explain principles of the application. It will be readily understood that the drawings are merely

[0047] The terms "first", "second", and similar terms used in the description are not intended to denote any order, quantity, or importance, but are used to distinguish different constituent parts. It should be noted that the features of the embodiments of the present application and the features in different embodiments can be combined with each other without conflict.

[0048] Figure 1 The structure of the torque feedback unit in the embodiment of the present application is shown; refer to Figure 1 The torque feedback unit provided by the embodiment of the present application is applied to a steer-by-wire system and includes:

[0049] The motor 10 and the worm shaft 20 coaxially connected with the motor 10 (share the same axis Z);

[0050] The tail end of the worm shaft 20 away from the motor 10 is provided with a torque measuring part 30, the torque measuring part 30 is a non-functional part of the torque feedback unit, and the torque measuring part 30 is clamped to transmit the output torque T of the motor 10 when detecting the output torque T of the motor 10.

[0051] The torque feedback unit can provide a resistance torque when the vehicle is steering to simulate the road feeling information feedback to the driver. The resistance torque is output by the motor 10 and transmitted to the steering shaft connected with the steering wheel through the worm shaft 20 and the worm wheel (not specifically shown in the figure) engaged with the worm shaft 20.

[0052] The torque feedback unit described above is provided with the torque measuring part 30 as a non-functional part at the tail end of the worm shaft 20, and the torque measuring part 30 can be clamped by the torque detection device to transmit the output torque T of the motor 10 when detecting the output torque T of the motor 10, so that the detection of the output torque T of the motor 10 does not affect the functional parts of the torque feedback unit, thereby ensuring the normal function of the torque feedback unit.

[0053] The torque feedback unit described above is provided with the torque measuring part 30 at the tail end of the worm shaft 20, and the worm shaft 20 is coaxially connected with the motor 10 and shares the same axis Z, so that the output torque T transmitted by the torque measuring part 30 is basically not lost; thereby, through the torque measuring part 30, the performance of the motor 10 can be accurately detected, and the performance of the motor 10 can meet the use requirements.

[0054] In addition, the torque feedback unit described above is provided with the torque measuring part 30 at the tail end of the worm shaft 20, and fully utilizes the space of the tail end of the worm shaft 20 along the axis Z of the worm shaft 20, which not only can accurately transmit the output torque T of the motor 10, but also will not have any impact on the strength of the parts of the torque feedback unit and the system transmission efficiency.

[0055] Figure 2 The explosion structure of the torque feedback unit provided with a gasket in the embodiment of the present application is shown;Figure 1 and Figure 2 As shown, in some embodiments, the torque measuring unit 30 includes a washer 30a fixedly sleeved on the tail end of the worm shaft 20. Figure 1 The torque measuring unit 30 shown is actually the washer 30a, but the present invention is not limited thereto; in the embodiments below, it will be combined with Figure 5 and Figure 6 In another form of torque measuring unit 30, a washer 30a is axially clamped between a first bearing 40 and a first limiting nut 50, and the outer periphery of the washer 30a is formed as a clamping part 33; wherein, the tail end of the worm shaft 20 is supported on the first bearing 40, and the first limiting nut 50 is screwed to the tail end of the worm shaft 20 and axially presses against the inner ring of the first bearing 40.

[0056] The first bearing 40 and the first limiting nut 50 are inherent functional components of the tail end of the worm shaft 20. The washer 30a is axially clamped between the first bearing 40 and the first limiting nut 50. The inherent functional components of the tail end of the worm shaft 20 can be used to achieve a fixed assembly with the worm shaft 20, thereby accurately transmitting the output torque T of the motor 10. Moreover, the washer 30a has a simple structure, is easy to assemble, occupies little space, and will not affect the inherent functional components of the worm shaft 20 or the transmission efficiency of the torque feedback unit.

[0057] In traditional testing methods, the torque detection device usually clamps the first limit nut 50 to detect the output torque T of the motor 10. This can easily cause the first limit nut 50 to loosen, affecting the normal functioning of the torque feedback unit.

[0058] Traditionally, the nut used to axially tighten the inner ring of the first bearing 40 is a flange nut; in this embodiment, the flange nut can be replaced with, for example... Figure 2 The ordinary nut shown in the first limiting nut 50 is used to create flange space between the first limiting nut 50 and the first bearing 40, and a washer 30a is installed. If the axial space at the tail end of the worm shaft 20 allows, the flange nut can be installed directly without replacing it.

[0059] In this embodiment, a non-functional component—washer 30a—is used to clamp the torque detection device when detecting the output torque T of the motor 10. This avoids affecting the functional components of the torque feedback unit, and enables accurate detection of the output torque T of the motor 10 without affecting the normal functioning of the torque feedback unit.

[0060] In some embodiments, the radial dimension of the clamping portion 33 is larger than the outer diameter of the first limiting nut 50. Therefore, when detecting the output torque T of the motor 10, the torque detection device can clamp the clamping portion 33 of the washer 30a beyond the first limiting nut 50.

[0061] In some embodiments, the radial dimension of the clamping portion 33 is also smaller than the inner diameter dimension of a second limiting nut 60; wherein the second limiting nut is fixed to the tail end of the housing 70 of the worm shaft 20 and axially presses the outer ring of the first bearing 40.

[0062] The second limiting nut 60 is an inherent functional component of the tail end of the worm shaft 20, and the radial dimension of the clamping portion 33 is smaller than the inner diameter dimension of the second limiting nut 60, which ensures that the arrangement of the clamping portion 33 does not affect the inherent functional components of the worm shaft 20, and facilitates the torque detection device to extend into the second limiting nut 60 to clamp the clamping portion 33 of the washer 30a when detecting the output torque T of the motor 10.

[0063] Figure 3 The structure of the washer 30a in an embodiment of the present application is shown, Figure 4 The structure of the washer 30a in another embodiment of the present application is shown; in combination Figures 1 to 4 As shown, in some embodiments, the clamping portion 33 is non-circular. Through the non-circular clamping portion 33, the torque detection device can be stably clamped.

[0064] Further, in some embodiments, the clamping portion 33 is hexagonal. Through the hexagonal clamping portion 33, the general torque detection device can be matched to achieve convenient detection of the output torque T of the motor 10 of the torque feedback unit.

[0065] In other embodiments, the clamping portion 33 can also be formed in other suitable non-circular shapes as long as it can be stably clamped.

[0066] In some embodiments, the inner periphery of the washer 30a is formed as a clamping portion 36, and the washer 30a is fixedly connected to the worm shaft 20 through the clamping portion 36. Through the clamping portion 36, the washer 30a can stably clamp the worm shaft 20 to accurately transmit the output torque T of the motor 10.

[0067] In some embodiments, the clamping portion 36 is non-circular. Through the non-circular clamping portion 36, the fixed clamping with the worm shaft 20 can be achieved.

[0068] Further, in some embodiments, the clamping portion 36 includes a radially symmetrical plane 36a and / or a radially inwardly convex boss 36b. Through one or more forms of the clamping portion 36 such as the radially symmetrical plane 36a and the radially inwardly convex boss 36b, the washer 30a stably clamps the worm shaft 20.

[0069] In other embodiments, the clamping portion 36 can also be formed in other suitable non-circular shapes as long as it can stably clamp the worm shaft 20.

[0070] Figure 5Structure of torque feedback unit provided with recess in the embodiment of the present application is shown; combined with Figure 1 and Figure 5 As shown in the figure, in some embodiments, the torque measuring part 30 comprises a recess 30b integrally formed at the tail end of the worm shaft 20, and the outer contour of the recess 30b is formed as a clamping part 33; wherein the tail end of the worm shaft 20 is provided with a threaded part (not specifically shown in the figure) for screwing the first limiting nut 50, and the recess 30b does not interfere with the threaded part.

[0071] Through the integrally formed recess 30b, the output torque T of the motor 10 can be accurately transmitted stably at the tail end of the worm shaft 20; and the recess 30b does not interfere with the threaded part, for example, a special-shaped hole is formed in the worm shaft from the end face of the tail end of the worm shaft to the inside of the worm shaft to form the recess 30b, which does not affect the threaded part provided on the outer wall of the tail end of the worm shaft 20; in this way, the part of the tail end of the worm shaft 20 is fully utilized without occupying other space, which not only realizes the transmission of the output torque T of the motor 10, but also does not affect the inherent functional components of the worm shaft 20 and the transmission efficiency of the torque feedback unit.

[0072] In the embodiment, as long as the shaft diameter of the tail end of the worm shaft 20 is sufficient, the recess 30b can be formed by opening an internal special-shaped hole at the tail end of the worm shaft 20. The shape of the clamping part 33 of the recess 30b is the same as that of the clamping part 33 of the washer 30a described above; for example, the recess 30b can be hexagonal or other non-circular special-shaped.

[0073] In the conventional detection method, the torque detection device usually clamps the first limiting nut 50 to detect the output torque T of the motor 10, which is easy to cause the first limiting nut 50 to loosen and affect the normal function realization of the torque feedback unit.

[0074] The conventional nut for axially pressing the inner ring of the first bearing 40 is usually a flange nut; in the embodiment, the flange nut can be replaced by a common nut as shown in the first limiting nut 50 in Figure 5 , so as to leave a flange space between the first limiting nut 50 and the first bearing 40, and make the axial space of the worm shaft 20 more compact.

[0075] In the embodiment, through the non-functional part, the recess 30b, for clamping by the torque detection device when detecting the output torque T of the motor 10, the functional part of the torque feedback unit can be avoided to be affected, and the accurate detection of the output torque T of the motor 10 can be realized without affecting the normal function realization of the torque feedback unit.

[0076] Figure 6 Structure of torque feedback unit provided with extension 30c in the embodiment of the present application is shown; combined with Figure 1 andFigure 6 As shown, in some embodiments, the torque measuring portion 30 includes an extension portion 30c integrally formed at the tail end of the worm shaft 20, the extension portion 30c is located at the side of the first limiting nut 50 away from the first bearing 40, and the outer contour of the extension portion 30c is formed as a clamping portion 33.

[0077] By the integrally formed extension portion 30c, the tail end of the worm shaft 20 is stably formed to accurately transmit the output torque T of the motor 10; and the extension portion 30c is located at the side of the first limiting nut 50 away from the first bearing 40, so that the space of the tail end of the worm shaft 20 can be fully utilized without affecting the inherent functional components of the worm shaft 20.

[0078] In the conventional detection method, the torque detection device usually clamps the outer contour 50' of the first limiting nut 50 to detect the output torque T of the motor 10, which is easy to cause the first limiting nut 50 to loosen and affect the normal function implementation of the torque feedback unit.

[0079] The conventional nut for axially pressing the inner ring of the first bearing 40 is usually a flange nut; in the present embodiment, the flange nut can be replaced by a common nut as shown in the first limiting nut 50, so as to leave a flange space, and the first limiting nut 50 is pushed inward to set the extension portion 30c. If the axial space of the tail end of the worm shaft 20 allows, the flange nut can not be replaced, and the extension portion 30c can be directly set. Figure 5

[0080] In the present embodiment, by the non-functional component, the extension portion 30c, for the torque detection device to clamp when detecting the output torque T of the motor 10, the functional components of the torque feedback unit can be avoided, and the accurate detection of the output torque T of the motor 10 can be realized without affecting the normal function implementation of the torque feedback unit.

[0081] The radial dimension of the extension portion 30c can be greater than, equal to, or less than the outer diameter dimension of the first limiting nut 50 according to the setting, as long as it is less than the inner diameter dimension of the second limiting nut 60 to facilitate the torque detection device to clamp the extension portion 30c.

[0082] The shape of the clamping portion 33 of the extension portion 30c is the same as that of the clamping portion 33 of the washer 30a described above, and will not be repeated here.

[0083] When setting the torque measuring portion 30, the washer 30a, the recessed portion 30b, the extension portion 30c, or other suitable torque measuring portion 30 can be flexibly set according to design needs, available space of the tail end of the worm shaft 20, and other factors.

[0084] In addition, in the above embodiments, the torque measuring portion 30 is combined with the washer 30a, the recessed portion 30b, and the extension portion 30c. Figure 1 , Figure 2 ,​Figure 5 and Figure 6 As shown in the figure, the end of the worm shaft 20 close to the motor 10 is supported by the second bearing 80. Among them, the second bearing 80 is a floating bearing, and the first bearing 40 is a fixed bearing, so as to realize the effective transmission between the motor 10 and the worm shaft 20.

[0085] The embodiment of the present application also provides a steer-by-wire system, and the steer-by-wire system comprises the torque feedback unit described in any of the above embodiments. The features and principles of the torque feedback unit described in any of the above embodiments can be applied to the steer-by-wire system, and the features and principles that have been described will not be repeated.

[0086] In summary, the torque feedback unit and the steer-by-wire system provided by the embodiment of the present application have the following advantages

[0087] Advantages:

[0088] The tail end of the worm shaft 20 is provided with the torque measuring part 30 as a non-functional part, and the torque measuring part 30 can be clamped by the torque detection device to transmit the output torque T of the motor 10 when detecting the output torque T of the motor 10, so that the detection of the output torque T of the motor 10 will not affect the functional parts of the torque feedback unit, thereby ensuring the normal function of the torque feedback unit;

[0089] The torque measuring part 30 is arranged at the tail end of the worm shaft 20 and coaxially connected with the motor 10, and the output torque transmitted by the torque measuring part 30 has basically no loss; thereby, through the torque measuring part 30, the performance of the motor 10 can be accurately detected, and it is ensured that the performance of the motor 10 meets the use requirements;

[0090] In addition, the torque measuring part 30 is arranged at the tail end of the worm shaft 20, and the space at the tail end of the worm shaft 20 along the axis of the worm shaft 20 is fully utilized, so that not only the output torque T of the motor 10 can be accurately transmitted, but also the strength of the parts of the torque feedback unit and the transmission efficiency of the steer-by-wire system will not be affected.

[0091] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. A torque feedback unit applied to a steer-by-wire system, the torque feedback unit comprising a motor and a worm shaft coaxially connected with the motor, characterized in that: a torque measuring part is arranged at a tail end of the worm shaft away from the motor, the torque measuring part being a non-functional part of the torque feedback unit, the torque measuring part being clamped to detect the output torque of the motor when transmitting the output torque of the motor; the torque measuring part comprises a washer fixedly sleeved on the tail end of the worm shaft, the washer being axially clamped between a first bearing and a first limiting nut, an outer periphery of the washer being formed as a clamping part, an inner periphery of the washer being formed as an engaging part, the washer being fixedly connected with the worm shaft through the engaging part; wherein the tail end of the worm shaft is supported by the first bearing, and the first limiting nut is screwed on the tail end of the worm shaft and axially abuts against an inner ring of the first bearing. the engaging part is non-circular.

2. The torque feedback unit of claim 1, wherein, the engaging part comprises a radially symmetrical plane and / or a radially inwardly convex boss.

3. The torque feedback unit of claim 2, wherein, a radial dimension of the clamping part is greater than an outer diameter dimension of the first limiting nut.

4. The torque feedback unit of claim 1, wherein, the radial dimension of the clamping part is also less than an inner diameter dimension of a second limiting nut; 5. The torque feedback unit of claim 4, wherein, wherein the second limiting nut is fixed on a tail end of a housing of the worm shaft and axially abuts against an outer ring of the first bearing. the clamping part is non-circular.

6. The torque feedback unit of claim 1, wherein, the clamping part is hexagonal.

7. The torque feedback unit of claim 6, wherein, a torque feedback unit according to any one of claims 1-7.

8. A steer-by-wire system characterized by, ​

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